This solution shows the connection lines paths of Nokia C3 sim card circuit on the PCB board layout. By using this solution you can easily determine which components or parts needs to check and or replace.
Nokia C3 Insert Sim Card Solution with SIM Filter IC Bypass Jumper
You may need to start to check the VSIM supply voltage, the Ground and the Data pins connection line paths for it has an open spots for testing. You may need to remove the SIM filter IC first for checking the CLOCK and RESET line paths.
In most cases by only replacing the SIM filter IC may only fix and repair Nokia C3 insert Sim card problem.